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Related Concept Videos

Freshwater Microbial Ecology01:24

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
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Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
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Primary Production01:06

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A Strain Gauge Monitor (SGM) for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
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Hypolimnetic oxygen depletion in eutrophic lakes.

Beat Müller1, Lee D Bryant, Andreas Matzinger

  • 1Eawag, Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum, Switzerland. beat.mueller@eawag.ch

Environmental Science & Technology
|August 9, 2012
PubMed
Summary

Deep-water anoxia in lakes is driven by oxygen consumption from settled organic matter and sediment diffusion. Understanding these processes aids lake restoration and management strategies.

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Published on: December 16, 2022

Area of Science:

  • Aquatic Ecology
  • Limnology
  • Environmental Science

Background:

  • Deep-water anoxia in freshwater lakes is poorly understood, hindering effective management.
  • Oxygen consumption in lake hypolimnia is a critical factor for ecosystem health.

Purpose of the Study:

  • To develop a model explaining dissolved oxygen consumption in eutrophic lake hypolimnia.
  • To identify key drivers of benthic oxygen consumption.

Main Methods:

  • Analysis of long-term monitoring data from 11 eutrophic lakes.
  • Quantification of oxygen consumption by settled organic material and diffusing reduced substances.
  • Assessment of hypolimnion thickness and oxygen concentration effects.

Main Results:

  • Areal hypolimnetic mineralization rates ranged from 0.47 to 1.31 g O(2) m(-2) d(-1).
  • Oxygen consumption is primarily driven by benthic flux of reduced substances and increases with hypolimnion thickness up to ~25m.
  • Benthic flux of reduced substances averaged 0.37 ± 0.12 g O(2) m(-2) d(-1).

Conclusions:

  • A two-process model accurately describes hypolimnetic oxygen consumption.
  • The model provides insights for predicting lake and reservoir responses to restoration.
  • Understanding these oxygen dynamics is crucial for effective lake management.